unable to get sum using distinct loop sum xslt - xslt-3.0

Question

I am new to xslt. I am creating a transform and need to calculate tax amount based on tax rate. The input file contains different tax rates and tax amount. The requirement is to look for common tax rates, take individual tax amount and sum them all. This creates a single T element.
If there are multiple tax rates, group common tax amounts and total them and form T element.
For example: Input file is:
<DATA>
<LIST_G_TRX>
<G_TRX>
<LIST_G_HEADER>
<G_HEADER>
<COUNTRYCODE>500</COUNTRYCODE>
<INVOICENUMBER>55005</INVOICENUMBER>
<CUSTOMER_TRX_ID>182066</CUSTOMER_TRX_ID>
<CUSTOMERID>5002013</CUSTOMERID>
<CUSTOMERORDERNUMBER>001</CUSTOMERORDERNUMBER>
<ORDERDATE>2019-01-09T00:00:00.000+00:00</ORDERDATE>
<INVOICEDATE>2019-01-09</INVOICEDATE>
<BILLTOCONTACT>XXXLutz Logistik AG</BILLTOCONTACT>
<BILLTONAME>XXXLutz Logistik AG</BILLTONAME>
<BILLTOADDRESS1>Römerstraße 999</BILLTOADDRESS1>
<BILLTOADDRESS2/>
<BILLTOADDRESS3/>
<BILLTOCITY>Wels</BILLTOCITY>
<BILLTOPOSTALCODE>4600</BILLTOPOSTALCODE>
<BILLTOCOUNTRYCODE>AT</BILLTOCOUNTRYCODE>
<CONTACTPHONENUMBER>11111111</CONTACTPHONENUMBER>
<CONTACTPHONEEXT/>
<CURRENCY>EUR</CURRENCY>
<CUSTOMERTAXID>ATU64784111</CUSTOMERTAXID>
<ODTAXID>FN 150931</ODTAXID>
<INVOICETYPE>R</INVOICETYPE>
<TOTALINVOICEVALUE>124.8</TOTALINVOICEVALUE>
<TOTALTAXABLEAMOUNT>104</TOTALTAXABLEAMOUNT>
<TOTALTAX>20.80</TOTALTAX>
<TOTALMISCCHARGE>0.00</TOTALMISCCHARGE>
<TOTALDETAILPRICE/>
<PAYERCUSTOMERID>5002013</PAYERCUSTOMERID>
<PAYERCONTACT>XXXLutz Logistik AG</PAYERCONTACT>
<PAYERNAME>XXXLutz Logistik AG</PAYERNAME>
<PAYERADDRESS1>Filialnummer ZL</PAYERADDRESS1>
<PAYERADDRESS2>Gewerbestrasse 29</PAYERADDRESS2>
<PAYERADDRESS3/>
<PAYERCITY>Sattledt</PAYERCITY>
<PAYERPOSTALCODE>4642</PAYERPOSTALCODE>
<PAYERCOUNTRY>AT</PAYERCOUNTRY>
<PAYERPHONENUMBER>22222222</PAYERPHONENUMBER>
<PAYERPHONEEXT/>
<SOLDTOCUSTOMERID>5002013</SOLDTOCUSTOMERID>
<SOLDTONAME>XXXLutz Logistik AG</SOLDTONAME>
<SOLDTOADDRESS1>Filialnummer ZL</SOLDTOADDRESS1>
<SOLDTOADDRESS2>Gewerbestrasse 29</SOLDTOADDRESS2>
<SOLDTOADDRESS3/>
<SOLDTOCITY>Sattledt</SOLDTOCITY>
<SOLDTOPOSTALCODE>4642</SOLDTOPOSTALCODE>
<SOLDTOCOUNTRY>AT</SOLDTOCOUNTRY>
<SOLDTOPHONENUMBER>22222222</SOLDTOPHONENUMBER>
<SOLDTOPHONEEXT/>
<SUPPLIERNAME>Viking Direkt GesmbH</SUPPLIERNAME>
<SUPPLIERADDRESS1>Tragweiner Str. 57</SUPPLIERADDRESS1>
<SUPPLIERADDRESS2/>
<SUPPLIERADDRESS3/>
<SUPPLIERCITY>Pregarten</SUPPLIERCITY>
<SUPPLIERPOSTALCODE>4230</SUPPLIERPOSTALCODE>
<SUPPLIERCOUNTRY>AT</SUPPLIERCOUNTRY>
<SUPPLIERPHONENUMBER/>
<SUPPLIERPHONEEXT/>
<REFERENCEINVOICENUMBER/>
<CREDITCARDNUMBER/>
<EMAILADDRESS/>
<DUEDATE>2019-01-14T00:00:00.000+00:00</DUEDATE>
<CREDITNOTEREASON/>
<LAST_PRINTED_DATE>2019-01-10T12:47:28.000+00:00</LAST_PRINTED_DATE>
<FIRST_PRINT_DATE>2019-01-10T12:47:28.000+00:00</FIRST_PRINT_DATE>
<PRINTING_COUNT>1</PRINTING_COUNT>
<TRANSACTION_SOURCE>Distributed Order Orchestration</TRANSACTION_SOURCE>
<LIST_G_LINES>
<G_LINES>
<CUSTOMER_TRX_ID>182066</CUSTOMER_TRX_ID>
<COUNTRYCODE>500</COUNTRYCODE>
<CUSTOMERID>5002013</CUSTOMERID>
<CUSTOMERORDERNUMBER>001</CUSTOMERORDERNUMBER>
<DELIVERYNOTENUMBER/>
<DELIVERYNOTELINENUMBER/>
<DELIVERYDATE>2019-01-09T00:00:00.000+00:00</DELIVERYDATE>
<INVOICELINENUMBER>2</INVOICELINENUMBER>
<ITEMNUMBER>6873291</ITEMNUMBER>
<INVOICEDQUANTITY>1</INVOICEDQUANTITY>
<PRICE>-20</PRICE>
<LINEAMOUNT>-20.00</LINEAMOUNT>
<ORDERNUMBER>840</ORDERNUMBER>
<UNITOFMEASURE>EA</UNITOFMEASURE>
<INVOICENUMBER>55005</INVOICENUMBER>
<TAXRATE/>
<TAXAMOUNT/>
<TAXCODE/>
<ITEMDESCRIPTION/>
<SHIPTOCONTACT/>
<SHIPTONAME>XXXLutz Logistik AG</SHIPTONAME>
<SHIPTOADDRESS1>Filialnummer ZL</SHIPTOADDRESS1>
<SHIPTOADDRESS2>Gewerbestrasse 29</SHIPTOADDRESS2>
<SHIPTOADDRESS3/>
<SHIPTOCITY>Sattledt</SHIPTOCITY>
<SHIPTOPOSTALCODE>4642</SHIPTOPOSTALCODE>
<SHIPTOCOUNTRY>AT</SHIPTOCOUNTRY>
<CONTACTPHONENUMBER>22222222</CONTACTPHONENUMBER>
<CONTACTPHONEEXT/>
<ORDERTYPE>R</ORDERTYPE>
<ORDERLINENUMBER>1</ORDERLINENUMBER>
<ORDERDATE>2019-01-09</ORDERDATE>
<CUSTOMERITEMDESCRIPTION/>
<INVOICELINECOMMENT1/>
<INVOICELINECOMMENT2/>
<TRANSACTIONID/>
<CUSTOMERCOSTCENTER/>
<CUSTOMERITEMNUMBER/>
<CUSTOMERORDERLINENUMBER/>
<ORDEREDQTY>1</ORDEREDQTY>
<SHIPPEDQTY>1</SHIPPEDQTY>
</G_LINES>
<G_LINES>
<CUSTOMER_TRX_ID>182066</CUSTOMER_TRX_ID>
<COUNTRYCODE>500</COUNTRYCODE>
<CUSTOMERID>5002013</CUSTOMERID>
<CUSTOMERORDERNUMBER>001</CUSTOMERORDERNUMBER>
<DELIVERYNOTENUMBER/>
<DELIVERYNOTELINENUMBER/>
<DELIVERYDATE/>
<INVOICELINENUMBER/>
<ITEMNUMBER/>
<INVOICEDQUANTITY/>
<PRICE/>
<LINEAMOUNT/>
<ORDERNUMBER/>
<UNITOFMEASURE/>
<INVOICENUMBER>55005</INVOICENUMBER>
<TAXRATE>20</TAXRATE>
<TAXAMOUNT>24.80</TAXAMOUNT>
<TAXCODE/>
<ITEMDESCRIPTION>HP 7612 e-All-in-One-GroAformatdrucker</ITEMDESCRIPTION>
<SHIPTOCONTACT/>
<SHIPTONAME/>
<SHIPTOADDRESS1/>
<SHIPTOADDRESS2/>
<SHIPTOADDRESS3/>
<SHIPTOCITY/>
<SHIPTOPOSTALCODE/>
<SHIPTOCOUNTRY/>
<CONTACTPHONENUMBER/>
<CONTACTPHONEEXT/>
<ORDERTYPE>R</ORDERTYPE>
<ORDERLINENUMBER/>
<ORDERDATE/>
<CUSTOMERITEMDESCRIPTION/>
<INVOICELINECOMMENT1/>
<INVOICELINECOMMENT2/>
<TRANSACTIONID/>
<CUSTOMERCOSTCENTER/>
<CUSTOMERITEMNUMBER/>
<CUSTOMERORDERLINENUMBER/>
<ORDEREDQTY/>
<SHIPPEDQTY/>
</G_LINES>
<G_LINES>
<CUSTOMER_TRX_ID>182066</CUSTOMER_TRX_ID>
<COUNTRYCODE>500</COUNTRYCODE>
<CUSTOMERID>5002013</CUSTOMERID>
<CUSTOMERORDERNUMBER>001</CUSTOMERORDERNUMBER>
<DELIVERYNOTENUMBER/>
<DELIVERYNOTELINENUMBER/>
<DELIVERYDATE/>
<INVOICELINENUMBER/>
<ITEMNUMBER/>
<INVOICEDQUANTITY/>
<PRICE/>
<LINEAMOUNT/>
<ORDERNUMBER/>
<UNITOFMEASURE/>
<INVOICENUMBER>55005</INVOICENUMBER>
<TAXRATE>20</TAXRATE>
<TAXAMOUNT>-4.00</TAXAMOUNT>
<TAXCODE/>
<ITEMDESCRIPTION>HP</ITEMDESCRIPTION>
<SHIPTOCONTACT/>
<SHIPTONAME/>
<SHIPTOADDRESS1/>
<SHIPTOADDRESS2/>
<SHIPTOADDRESS3/>
<SHIPTOCITY/>
<SHIPTOPOSTALCODE/>
<SHIPTOCOUNTRY/>
<CONTACTPHONENUMBER/>
<CONTACTPHONEEXT/>
<ORDERTYPE>R</ORDERTYPE>
<ORDERLINENUMBER/>
<ORDERDATE/>
<CUSTOMERITEMDESCRIPTION/>
<INVOICELINECOMMENT1/>
<INVOICELINECOMMENT2/>
<TRANSACTIONID/>
<CUSTOMERCOSTCENTER/>
<CUSTOMERITEMNUMBER/>
<CUSTOMERORDERLINENUMBER/>
<ORDEREDQTY/>
<SHIPPEDQTY/>
</G_LINES>
<G_LINES>
<CUSTOMER_TRX_ID>182066</CUSTOMER_TRX_ID>
<COUNTRYCODE>500</COUNTRYCODE>
<CUSTOMERID>5002013</CUSTOMERID>
<CUSTOMERORDERNUMBER>001</CUSTOMERORDERNUMBER>
<DELIVERYNOTENUMBER/>
<DELIVERYNOTELINENUMBER/>
<DELIVERYDATE>2019-01-09T00:00:00.000+00:00</DELIVERYDATE>
<INVOICELINENUMBER>1</INVOICELINENUMBER>
<ITEMNUMBER>6873291</ITEMNUMBER>
<INVOICEDQUANTITY>1</INVOICEDQUANTITY>
<PRICE>124</PRICE>
<LINEAMOUNT>124.00</LINEAMOUNT>
<ORDERNUMBER>840</ORDERNUMBER>
<UNITOFMEASURE>EA</UNITOFMEASURE>
<INVOICENUMBER>55005</INVOICENUMBER>
<TAXRATE/>
<TAXAMOUNT/>
<TAXCODE/>
<ITEMDESCRIPTION/>
<SHIPTOCONTACT/>
<SHIPTONAME>XXXLutz Logistik AG</SHIPTONAME>
<SHIPTOADDRESS1>Filialnummer ZL</SHIPTOADDRESS1>
<SHIPTOADDRESS2>Gewerbestrasse 29</SHIPTOADDRESS2>
<SHIPTOADDRESS3/>
<SHIPTOCITY>Sattledt</SHIPTOCITY>
<SHIPTOPOSTALCODE>4642</SHIPTOPOSTALCODE>
<SHIPTOCOUNTRY>AT</SHIPTOCOUNTRY>
<CONTACTPHONENUMBER>22222222</CONTACTPHONENUMBER>
<CONTACTPHONEEXT/>
<ORDERTYPE>R</ORDERTYPE>
<ORDERLINENUMBER>1</ORDERLINENUMBER>
<ORDERDATE>2019-01-09</ORDERDATE>
<CUSTOMERITEMDESCRIPTION/>
<INVOICELINECOMMENT1/>
<INVOICELINECOMMENT2/>
<TRANSACTIONID/>
<CUSTOMERCOSTCENTER/>
<CUSTOMERITEMNUMBER/>
<CUSTOMERORDERLINENUMBER/>
<ORDEREDQTY>1</ORDEREDQTY>
<SHIPPEDQTY>1</SHIPPEDQTY>
</G_LINES>
</LIST_G_LINES>
My output should be similar to this:
<H>
<tax rate 20>
<tax amount 102.60>
</H>
<H>
<tax rate 7>
<tax amount 21.50>
</H>
<H>
<tax rate 19>
<tax amount 13.28>
</H>
My xslt is:
<xsl:variable name="vTaxRateCount" select="count(distinct-values(LIST_G_LINES/G_LINES/TAXRATE))"/>
<xsl:variable name="vDistinct">
<xsl:for-each select="fn:distinct-values(LIST_G_LINES/G_LINES/TAXRATE)">
<xsl:element name="Values">
<xsl:value-of select="."/>
</xsl:element>
</xsl:for-each>
</xsl:variable>
<xsl:variable name="vPath" select="LIST_G_LINES/G_LINES/TAXAMOUNT"/>
<xsl:for-each select="$vDistinct/Values">
<xsl:variable name="vUniqueVal" select="."/>
<xsl:for-each select="LIST_G_LINES/G_LINES/TAXRATE=.">
<xsl:element name="TaxAmount">
<xsl:value-of select="sum($vPath[#TAXRATE = $vUniqueVal])"/>
<xsl:value-of select="$vUniqueVal"/>
</xsl:element>
</xsl:for-each>
</xsl:for-each>
This code doesn't seem to work. Could you please help.

Answer 1

From your input and given XSLT, assuming the input file as below: (if it is XML)
<?xml version="1.0" encoding="UTF-8"?>
<LIST_G_LINES>
<G_LINES>
<Taxrates> 20 <Taxamount> 1.60 </Taxamount></Taxrates>
</G_LINES>
<G_LINES>
<Taxrates> 7 <Taxamount> 21.50 </Taxamount></Taxrates>
</G_LINES>
<G_LINES>
<Taxrates> 19 <Taxamount> 1.60 </Taxamount></Taxrates>
</G_LINES>
<G_LINES>
<Taxrates> 19 <Taxamount> 11.68 </Taxamount></Taxrates>
</G_LINES>
<G_LINES>
<Taxrates> 20 <Taxamount> 101 </Taxamount></Taxrates>
</G_LINES>
</LIST_G_LINES>
An XSLT 2.0 solution can be as following:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes="xs">
<xsl:output method="xml" indent="yes" />
<xsl:template match="/LIST_G_LINES">
<xsl:for-each-group select="G_LINES" group-by="Taxrates/text()">
<H>
<TaxRate>
<xsl:value-of select="current-grouping-key()" />
</TaxRate>
<TaxAmount>
<xsl:value-of select="sum(current-group()/Taxrates/Taxamount)" />
</TaxAmount>
</H>
</xsl:for-each-group>
</xsl:template>
</xsl:stylesheet>
Refer here to see the output
Edit: Based on your updated XML, you can try the following XSLT 3.0 solution:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:math="http://www.w3.org/2005/xpath-functions/math"
exclude-result-prefixes="xs math" version="3.0">
<xsl:mode streamable="yes" />
<xsl:output method="xml" indent="yes" />
<xsl:template match="/">
<xsl:for-each-group select="DATA/LIST_G_TRX/G_TRX/LIST_G_HEADER/G_HEADER/LIST_G_LINES/G_LINES" composite="yes" group-by="TAXRATE">
<xsl:if test="current-grouping-key() != ''">
<H>
<TaxRate>
<xsl:value-of select="current-grouping-key()" />
</TaxRate>
<TaxAmount>
<xsl:value-of select="sum(current-group()/TAXAMOUNT)" />
</TaxAmount>
</H>
</xsl:if>
</xsl:for-each-group>
</xsl:template>
</xsl:stylesheet>